Table 2.
Results (mean and SD) of all home and laboratory studies
| Scoring criteria AASM 2007 | Sleep parameters | Units | Index time base | Separate PSG
|
Simultaneous PSG
|
Index time base | Simultaneous PDX
|
At-home PDX
|
||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | SD | Mean | SD | Mean | SD | Mean | SD | |||||
| TRT | (min) | TIB | 457.6 | 55.3 | 453.4 | 47.6 | TRT | 422.1 | 72.4 | 423.3 | 91.0 | |
| TST | (min) | TST | 373.2 | 76.8 | 364.1 | 65.8 | – | – | – | – | – | |
| Total arousal index | (n/h) | TST | 29.3 | 15.9 | 29.8 | 16.0 | – | – | – | – | – | |
| Average saturation | (%) | TST | 94.8 | 1.8 | 94.8 | 1.6 | TRT | 93.9 | 1.9 | 93.6 | 2.1 | |
| Apnea index | (n/h) | TST | 13.7 | 17.5 | 14.2 | 17.8 | TRT | 12.2 | 15.8 | 11.1 | 16.0 | |
| Hyp A | Hypopnea index | (n/h) | TST | 4.6 | 7.6 | 4.9 | 7.4 | TRT | 5.3 | 6.3 | 5.1 | 5.2 |
| AHI | (n/h) | TST | 18.2 | 20.2 | 19.0 | 20.2 | TRT | 17.4 | 17.7 | 16.3 | 17.6 | |
| Supine AHI | (n/h) | TST supine | 26.8 | 25.6 | 27.1 | 27.7 | TRT supine | 24.9 | 25.2 | 24.7 | 25.4 | |
| Respiratory arousal index | (n/h) | TST | 10.3 | 14.6 | 10.6 | 13.6 | – | – | – | – | – | |
| Desaturation index | (n/h) | TST | 13.4 | 18.3 | 14.8 | 18.8 | TRT | 14.7 | 15.9 | 13.9 | 16.1 | |
| Hyp B | Hypopnea index | (n/h) | TST | 6.7 | 8.0 | 7.1 | 8.2 | TRT | 7.7 | 6.7 | 7.6 | 6.0 |
| AHI | (n/h) | TST | 20.7 | 20.7 | 21.3 | 20.6 | TRT | 19.9 | 18.0 | 18.7 | 18.2 | |
| Supine AHI | (n/h) | TST supine | 29.3 | 25.7 | 30.3 | 28.4 | TRT supine | 28.3 | 26.5 | 28.1 | 26.3 | |
| Respiratory arousal index | (n/h) | TST | 14.3 | 15.3 | 14.5 | 14.5 | – | – | – | – | – | |
| Desaturation index | (n/h) | TST | 18.5 | 19.7 | 19.9 | 20.7 | TRT | 20.7 | 17.8 | 19.1 | 17.7 | |
Notes: Hypopnea A: flow amplitude drop ≥30% with desaturation >4% without considering arousals; Hypopnea B, flow amplitude drop ≥50% with either desaturation >3% or arousal or both.
Abbreviations: AASM, American Academy of Sleep Medicine; PSG, polysomnography; SD, standard deviation; AHI, apnea hypopnea index; TRT, total recording time; TST, total sleep time; TIB, time in bed.